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arXiv 1107.0743cond-mat.dis-nn
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Bethe格点上T=0的RFIM:磁滞回线上的关联函数

The T=0 RFIM on a Bethe lattice: correlation functions along the hysteresis loop

Xavier Illa, M. L. Rosinberg

摘要:

本文研究了Bethe晶格上的高斯随机场伊辛模型,在零温和均匀外场的作用下,导出了沿饱和磁滞回线的两点自旋-自旋和自旋-随机场关联函数的精确表达式。为了完成的分析描述,并建议可能的近似的欧几里得晶格上的RdR,我们还计算相应的直接关联函数(或适当的顶点),并表明,他们迅速衰减的距离在弱耦合/大的无序制度,但其范围并不限于最近的邻居距离。

英文摘要:

We consider the Gaussian random field Ising model (RFIM) on the Bethe lattice at zero temperature in the presence of a uniform external field and derive the exact expressions of the two-point spin-spin and spin-random field correlation functions along the saturation hysteresis loop. To complete the analytical description and suggest possible approximations for the RFIM on Euclidian lattices we also compute the corresponding direct correlation functions (or proper vertices) and show that they decay rapidly with the distance in the weak-coupling/large disorder regime; their range, however, is not limited to the nearest-neighbor distance.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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